Fix the tongue on the palate, direct the eyes to the vertex and nose [alternately], cause the fire of the heart to descend to and enter the yung-chuen (acupuncture aperture in the centre of the sole of the foot), draw up the kidney water (semen) to the kw’ên-lun. In performing it, do it 3 times each time; set it on fire in 36 mouthfuls.